Expreview has got their hands on what they're claiming are the final clock speeds of the GeForce 9800 GX2 and if these numbers are indeed correct, then this card might not be as fast as expected.

The GPUs will be clocked at 600MHz, that's 50MHz slower than the 8800 GTS, or the same as the 8800 GT. The Shaders will apparently be clocked at 1,500MHz, again slower than the 8800 GTS which has its Shaders clocked to 1,625MHz.